html{
  height:100vh;
}
body {
  padding: 0;
  margin: 0;
  -webkit-user-select: none;
  height: 100vh;
  overflow: hidden;
  font-family: "Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,sans-serif;
}